Ruby is a song by English rock band Kaiser Chiefs and is the lead track on their second album, Yours Truly, Angry Mob. It was released as the lead single from that album in the United Kingdom as a download on February 5, 2007 and as a limited edition 7" and CD single on February 19 that year. It became the band's first ever #1 single on February 25, 2007, and ended 2007 as the year's 10th biggest-selling single in the UK with total sales of 313,765.
A video single of the song was released in the United States at Best Buy stores on March 13, 2007, two weeks before the album was released there, and featured a live version of "Everything Is Average Nowadays" and the B-side "Admire You" (released on the UK 7" version). The song is featured as a bonus track in Guitar Hero III: Legends of Rock, is featured in Project Gotham Racing 4, in SingStar vol. 2 for the PlayStation 3 and as a song in Lego Rock Band.
The song has sold 375,000 copies in the UK as stated by the Official UK Charts Company. Ruby also was voted #13 in the Triple J Hot 100 in 2007, beaten by acts such as Muse, Foo Fighters and Kings of Leon.